In-Class Problem/Take-Home Problem 6: For the following aqueous rxn, 0.15M C and 0.087M D are allowed to react.

In-Class Problem/Take-Home Problem 6: For the following aqueous rxn, 0.15M C and 0.087M D are
allowed to react. At equilibrium, only 0.009M D remains. Calculate K and all of the equilibrium
concentrations.
2A + B  C + 3D

Expert Solution

2 A + B <-----------------------------> C + 3 D

0 0 0.15 0.087 ----------------------> initial

+2x x -x -3x --------------------------> change

2x x 0.15-x 0.087-3x ----------------------> equilibrium

but it is given D at equilibrium 0.087-3x = 0.009

x = 0.026

equilibrium concentrations :

[A] = 2x = 0.052 M

[B] = x = 0.026 M

[C] = 0.15-x = 0.12 M

[D] = 0.009 M

equilibrium constant K = products / reactnats

= (0.12) (0.009)^3 / (0.052)^2 (0.026)

= 1.29 x 10^-3

queen_honey_blossom answered 3 years ago

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